London police say they have arrested a man for possession of weapons near Britain's Houses of Parliament.

The Metropolitan Police force said the incident that unfolded Thursday is over and no one has been injured.

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Witnesses reported seeing armed police blocking off Whitehall, a street lined with government buildings, and a man on the ground.

Security has been increased around Parliament after an attacker drove an SUV into pedestrians on nearby Westminster Bridge on March 22 before stabbing a police officer to death inside the gates of Parliament. The attacker was shot dead by police.

Thursday is Parliament's last sitting day before Britain's June 8 election.